Proximity Sensor Optical Interface for High-Speed Data Transfer
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Solution Overview
Problem
Conventional light-based proximity sensors in electronic devices are limited to detecting the presence of nearby objects and do not facilitate additional functionalities such as high-speed data communication or firmware updates.
Innovation Solution
Reusing the light-based proximity sensor as an optical communication interface, enabling it to operate in both proximity sensing and data communication modes, utilizing pulse width and amplitude modulation schemes for high-speed data transfers and lower-speed chip-to-chip communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the proximity sensor is used only for detecting nearby objects, then the sensor structure remains simple, but additional functionalities such as high-speed data communication and firmware updates cannot be achieved
Solution Approach 1:
The proximity sensor is designed to perform multiple functions: it detects nearby objects using reflected light and simultaneously serves as an optical communication interface for high-speed data transfers and firmware updates. The same light source and light detector components are reused for both proximity sensing and data communication, eliminating the need for separate dedicated components and reducing overall system complexity.
2Productivity
If the proximity sensor is reused for optical data transmission, then high-speed firmware updates and data communication are enabled, but the sensor must support multiple operating modes increasing complexity
Solution Approach 1:
The control circuitry dynamically switches the proximity sensor between proximity sensing mode and data communication mode based on operational requirements. The system can adaptively select appropriate modulation schemes (pulse width modulation or amplitude modulation) and communication protocols (such as eUSB 2) depending on the specific task, enabling flexible high-speed data transfers and firmware updates without requiring permanent complex circuitry for all functions simultaneously.
3Speed
If pulse width modulation scheme is used for encoding optical data, then high-speed data communication is achieved, but more complex decoding circuitry is required
Solution Approach 1:
The system employs pulse width modulation for encoding optical data to achieve high-speed communication. The control circuitry is designed with integrated decoding capabilities that can process pulse width modulated signals by measuring pulse durations and converting them back to original data. The circuitry includes timing circuits and comparators that can detect and interpret pulse width variations, enabling high-speed data recovery without requiring excessively complex external decoding hardware.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-speed firmware updates and data communication by repurposing the proximity sensor for optical data transmission, supporting protocols like eUSB 2 and reducing power consumption through asynchronous electrical protocols.
Implementation Method 1
A light-based proximity sensor may have a light source such as an infrared light-emitting diode and may have a light detector. During operation, the light source emits light. In the presence of nearby objects, some of the emitted light is reflected back towards the proximity sensor and is detected by the light detector.
Implementation Method 2
A light-based proximity sensor may have a light source such as an infrared light-emitting diode and may have a light detector. By monitoring the amount of reflected light at the light detector, an electronic device may determine whether an external object is in the vicinity of the electronic device.
Implementation Method 3
The optical transceiver circuitry may include a light source such as an infrared laser diode and a photodetector.
Data Source
AI summary
An electronic device may include a proximity sensor for detecting whether an external object is in the vicinity of the device. The proximity sensor may have a light detector and a light source that can be reused for data communications. The light detector may be coupled to optical receiver circuitry, whereas the light source may be coupled to optical transmitter circuitry. The optical transmitter circuitry may include encoding circuits configured to convert electrical signals to optical signals. The optical receiver circuitry may include decoding circuits configured to convert optical signals to electrical signals. The optical signals can be encoded and decoded using pulse width modulation schemes or amplitude modulation schemes.